Table 1.
Baseline characteristics and presence of signs of puberty by sex and age, separately for each birth cohort and pooled
| PIAMA (n=3963) | BAMSE (n=4089) | GINIplus (n=5991) | LISA (n=3094) | MAS (n=1314) | Total | |||||||
| Boys n/N (%) |
Girls n/N (%) |
Boys n/N (%) |
Girls n/N (%) |
Boys n/N (%) |
Girls n/N (%) |
Boys n/N (%) |
Girls n/N (%) |
Boys n/N (%) |
Girls n/N (%) |
Boys (%) | Girls (%) | |
| Sex | 2054/3963 (51.8) |
1909/3963 (48.2) |
2065/4089 (50.5) |
2024/4089 (49.5) |
2991/5830 (51.3) |
2839/5830 (49.7) |
1584/3094 (51.2) |
1510/3094 (48.8) |
684/1314 (52.1) |
630/1314 (48.0) |
51.3 | 48.8 |
| Parental allergy | 885/2025 (43.7) |
805/1889 (42.6) |
1001/2050 (48.8) |
976/2007 (48.6) |
1022/2340 (43.7) |
998/2214 (45.1) |
738/1470 (50.2) |
710/1384 (51.3) |
275/643 (42.8) |
300/601 (49.9) |
45.9 | 47.4 |
| Maternal smoking during pregnancy | 356/2037 (17.5) |
344/1889 (18.2) |
272/2065 (13.2) |
259/2023 (12.8) |
383/2474 (15.5) |
356/2327 (15.3) |
262/1524 (17.2) |
274/1450 (18.9) |
154/627 (24.6) |
154/584 (26.4) |
17.2 | 17.9 |
| Puberty at age 10 | – | – | – | – | 63/1593 (3.9) |
170/1372 (12.4) |
31/853 (3.6) |
85/702 (12.1) |
0/394 (0) |
58/326 (17.8) |
1.9 | 13.6 |
| Puberty at age 11 | 40/1316 (3.0) |
796/1295 (61.5) |
– | – | – | – | – | – | 1/368 (0.3) |
147/299 (49.2) |
1.4 | 55.6 |
| Puberty at age 12 | – | – | 424/1390 (30.5) |
1184/1353 (87.5) |
– | – | – | – | 21/361 (5.8) |
261/346 (75.4) |
16.3 | 82.0 |
| Puberty at age 13 | – | – | – | – | – | – | – | – | 117/373 (31.4) |
369/387 (95.4) |
31.4 | 95.4 |
| Puberty at age 14 | 1092/1264 (86.4) |
1363/1366 (99.8) |
– | – | – | – | – | – | – | – | 86.4 | 99.8 |
| Puberty at age 15 | – | – | – | – | 1125/1268 (88.7) |
1274/1330 (95.8) |
683/741 (92.2) |
678/723 (93.8) |
289/315 (91.8) |
390/393 (99.2) |
90.8 | 96.6 |
| Puberty at age 16 | – | – | 1231/1318 (93.4) |
1594/1623 (98.2) |
– | – | – | – | – | – | 93.4 | 98.2 |
BAMSE, Swedish abbreviation for Children, Allergy, Milieu, Stockholm, Epidemiology; GINIplus, German Infant Nutritional Intervention-Program; LISA, Lebensstil, Immunsystem, Allergien; MAS, Multizentrische Allergie Studie; n, number of participants per analysis; N, total number of participants at time of recruitment; PIAMA, Prevention and Incidence of Asthma and Mite Allergy.